Hello everyone,I have now fulfilled a dream and bought me a Cadillac Fleetwood. The vehicle is in a top condition, very well maintained etc. My real problem is that the car has from time to time detonator ?, the cat has dissolved into its best parts, literally melted down.The candles look good. So the problem is as follows: drive at constant speed and at once no more gas acceptance, full throttle rumble and he walks again Like hell. This occurs in irregular distances. I also had a stable ruckel during constant drive. It is a 4.5 l V 8 installed with TBI injection system. Have also measured the fuel pressure, which is OK. Has a tip or an idea where to look ?? The Caddy is BJ 1989